Beep symptoms

Table 3. Beep symptoms

Symptom or error

FRU or action, in sequence

 

 

 

One beep and a blank, unreadable, or

1.

Reseat the LCD connector.

flashing LCD.

2.

LCD assembly.

 

3.

External CRT.

 

4.

System board.

 

 

 

One long and two short beeps, and a blank

1.

System board.

or unreadable LCD.

2.

LCD assembly.

 

3.

DIMM.

 

 

Two short beeps with error codes.

POST error. See “Numeric error codes” on

 

page 39.

 

 

 

Two short beeps and a blank screen.

1.

System board.

 

2.

DIMM.

 

 

 

Three short beeps, pause, three more short

1.

DIMM.

beeps, and one short beep.

2.

System board

 

 

 

One short beep, pause, three short beeps,

 

 

pause, three more short beeps, and one short

 

 

beep.

 

 

 

 

Only the cursor appears.

Reinstall the operating system.

 

 

Four cycles of four short beeps and a blank

System board (security chip)

screen.

 

 

 

 

Five short beeps and a blank screen.

System board

 

 

 

No-beep symptoms

Table 4. No-beep symptoms

Symptom or error

FRU or action, in sequence

 

 

 

No beep, power-on indicator on, LCD blank,

1.

Make sure that every connector is

and no POST.

 

connected tightly and correctly.

 

2.

DIMM.

 

3.

System board.

 

 

 

No beep, power-on indicator on, and LCD

1.

Reseat DIMM.

blank during POST.

2.

System board.

 

 

 

The power-on password prompt appears.

A power-on password or a supervisor

 

password is set. Type the password and

 

press Enter.

 

 

The hard-disk password prompt appears.

A hard-disk password is set. Type the

 

password and press Enter.

 

 

 

44ThinkPad T400 and R400Hardware Maintenance Manual

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IBM R400 manual Beep symptoms, No-beep symptoms